[amsat-bb] Linear vs Circular Polarization

R.T.Liddy k8bl at ameritech.net
Wed Apr 12 23:25:47 UTC 2017


I found a good discussion on this topic at:


And here's a link for a discussion on CP antennas:


BTW, I have linear antennas, 2M Horiz & 70 cm Vert, and experience deep
fades. This requires me to time my calls to when I'm fairly sure I'll be
able to hear responses.

GL/73,  Bob  K8BL

P.S. Don't Google RHCP unless you are a fan of the Red Hot Chili Peppers! :o)

From: Brady Gordon <ac0xr at lowswr.com>
To: amsat-bb at amsat.org 
Sent: Wednesday, April 12, 2017 5:17 PM
Subject: [amsat-bb] Linear vs Circular Polarization

Hi Everyone,

I'm working on building a pair of crossed yagis for 2m and 70cm, and I have

some questions.  I apologize if this has been discussed before, but I

couldn't find answers online so I was hoping you all could help me out.

First, it seems easiest to me to build an antenna system that can either

switch between vertical and horizontal linear polarizations, or between

right hand and left hand circular polarization.  Which would be more

useful?  And is it worth the extra effort to build an antenna system that

can switch between all four polarizations?

Also, I've been looking at the different ways of achieving circular

polarization.  I like the idea of using mechanical 1/4 wave separation

between the two yagis so I don't have to cut phasing lines.  Would it be

possible to switch polarizations by putting a relay at the feedpoint of one

of the yagis and switching which side of the driven element the center

conductor and shield of the coax goes to?  I've never seen this done

before, but it seems to me it would work.  Any thoughts?

Thanks and 73,

Brady AC0XR


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